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USGS
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80-852
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UNITED STATES DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY
GEOPHYSICAL AND LITHOLOGIC LOGS OF NINE
TEST HOLES DRILLED DURING 1978
IN HARDING COUNTY, SOUTH DAKOTA
By
Frank B. Kistner
Open-File Report 80-852
1980
This report has not been edited for conformity
with U.S. Geological Survey editorial standards
or stratigraphic nomenclature
Gr^oo^^7"

CONTENTS
Introduction———• 1
Acknowledgements—— • • • 3
References cited 5
Geophysical and lithologic logs- :-. • • 6
ILLUSTRATION
Figure 1. Map showing coal test hole locations in Harding County— 4
TABLE
Table 1. Summary of information for nine coal test holes in
Hard ing County • —. • •
To convert
English units
Inches.(in)
Feet (ft)
brn
carb
It
LTD
NR
ss
w/
Conversion Table
Multiply by
2.54
0.3048
Abbreviations
^
-
-
-
-
-
-
brown
carbonaceous
light
Logged Total Depth
No Record
sandstone
with
To obtain
metric units
Page
Centimeters (cm)
Meters (m)

GEOPHYSICAL AND LITHOLOGIC LOGS OF NINE TEST HOLES
DRILLED DURING 1978 IN HARDING COUNTY, SOUTH DAKOTA
By Frank B. Kistner
INTRODUCTION
Between October 25 and November 1, 1978, nine coal test holes were
drilled and geophysically logged near Ludlow, in Harding County, South
Dakota (fig. 1). Drilling was conducted by personnel (and drilling
equipment) of the U.S. Geological Survey (USGS) as part of an ongoing
USGS program to evaluate and classify mineral lands in the public domain.
The purpose of the program is to gather data on the thickness, extent,
correlation, quality, and recoverability of coal beds, and the thickness
and lithologic characteristics of the associated rocks in the Tertiary
Tongue River and Ludlow-Cannonball Members of the Fort Union Formation
in the Williston Basin.
The occurrence of lignite in northwestern South Dakota has been
discussed by several writers (Winchester and others, 1916; Searight,
1930; Baker, 1952). Discovery of uranium associated with these lignites
has drawn the attention of numerous Investigators to this area since the
mid-1950's (Cuirtiss, 1955; Denson and others, 1959; Pipiringos and others,
1965; Dane, 1978). Several authors (Hares, 1928; Kepferle and Culbertson,
1955; Rehbeln, 1977) have discussed the general geology, stratigraphy,
and depositional environments of the thidker lignite deposits in North
Dakota. These discussions apply in a general way to the coal geology of
northwestern South Dakota.

Although considerable uranium exploration drilling has been conducted
in the Ludlow area, there has been no previous coal drilling to the writer's
knowledge. This report presents geophysical logs and field lithologic de­
scriptions lagged (or corrected in depth intervals) to match the geophysical
logs. Test holes CD-78001 through CD-78071, inclusive, and test hole CD-78081
were drilled in Wyoming and their logs were presented in a report by Kistner
and others (1980). Table 1 lists the locations and test-hole numbers of all
holes drilled in Harding County, South Dakota, during the 1978 field season.
Specific drill-site locations, following the system of land survey used
by the U.S. Bureau of Land Management, appear on the individual log headings.
The locations are expressed as distances, in feet, scaled from section lines
as they appear on topographic quadrangle sheets. Elevations are approximate
for all test holes.
A conventional rotary drill was used, with circulating water as the
usual drilling fluid. Continuous lO-foot samples were collected except
where circulation was difficult to maintain. Where circulation could not
be maintained an air-mist drilling medium was used and no samples were
collected. Samples were logged by a geologist in the field and then bagged
and sent to the USGS storage facilities in Casper, Wyoming. Field logs
were completed for each test hole and are on file in Casper.
The usual geophysical logging procedure was to run a multiconductor
probe equipped with gamma-ray, resistance, and spontaneous potential
detectors. Where problems existed with drill-hole instability, the drill
pipe was used to temporarily case the hole, and a gamma-ray casing collar
locator log was run through the drill pipe. The logs were photographically
reduced to a vertical scale of 1 inch to 50 feet for convenience in reproducing
this report, and the originals are on file at the Casper office.

The Identification of lignites from geophysical logs is discussed at
length by Kaiser (1974, p. 32), Kaiser and others (1978, p. 67-68), and
Rehbeln (1977, p. 3-4). Gamma-ray logs were found to be generally the
most useful, followed in order of usefulness by density, neutron, acoustic
(sonic), and electrical logs. Induction logs, used alone, were found to
be the least reliable for the identification of lignite beds, especially
near the outcrop. This experience is supported by the logs presented in
this report. The single-point resistance log often does not respond to
lignites. Is is thought that the water quality and content of the lignites
in relation to their enclosing rocks dictates this lack of electrical
response.
ACKNOWLEDGEMENTS
Fieldwork was carried out by the following USGS personnel: Frank B.
Kistner, geologist; Gregg A. Hollomon, technician; Harry R. Cureton, driller.
Supervision and technical guidance were provided by Frank B. Kistner and
Robert C. Lewis.

45045—
BOWMAN CO
I03°22'30'
NORTH DAKOTA
Figure 1. - Coal test holes drilled during 1978 in Harding
County, South Dakota, (Hole numbers in Table 1 are preceded by CD-780 .)
Table 1.—Summary of information for nine coal test holes in Harddng
County, South Dakota
Test-hole
Number T.N.
CD-78072
CD-78073
CD-78074
CD-78075
CD-78076
CD-78077
CD-78078
GD-78079
CD-78080
22
21
21
21
22
22
22
22
21
Location
R.E. Sec. 1/4
6
7
7
7
9
8
7
5
6
34
18
19
22
30
19
9
26
14
NE
NW
SE
SW
SW
NW
NW
SW
NE
Depth (feet)
Drilled Logged
400
200
500
300
540
500
420
620
200
390
200
490
300
530
490
.417
610
190

REFERENCES CITED
Baker, C. L., 1952, Geology of Harding County: South Dakota Geological
Survey Report of Investigations 68, 36 p.
Curtiss, R. E., 1955, A preliminary report on the uranium in South Dakota:
South Dakota Geological Survey Report of Investigations 79, 102 p.
Dane, J. K., 1978, Alteration of sedimentary rocks related to uranium
mineralization in the North Cave Hills of Harding County, South Dakota:
South Dakota School of Mines and Technology, Rapid City, South Dakota,
unpublished M.S. thesis, 45 p.
Denson, N. M., Bachman, G. 0., and Zeller, H. D., 1959, Uranium-bearing
lignite in northwestern South Dakota and adjacent states: U.S.
Geological Survey Bulletin 1055-B, 46 p.
Hares, C. J., 1928, Geology and lignite resources of the Marmarth field,
southwestern North Dakota: U.S. Geological Survey Bulletin 775, 110 p.
Kaiser, W. R., 1974, Texas lignite—Near-surface and deep-basin resources:
University of Texas, Bureau of Economic Geology, Report of Investigations
79, 70 p.
Kaiser, W. R.^ Johnston, J. E., and Bach, W. H., 1978, Sand-body geometry and
the occurrence of lignite in the Eocene of Texas, isi Proceedings of the
Second Symposium on the Geology of Rocky Mountain Coal—1977: Colorado
Geological Survey Resource Series 4, p. 67-87.
Kepferle, R. C, and Culbertson, W. C, 1955, Strippable lignite deposits.
Slope and Bowman Counties, North Dakota:. U.S. Geological Survey
Bulletin 1015-E, 182 p.
Kistner, F. B., Donatich, A. J., and Hollomon, G. A., 1980, Lithologic and
geophysical logs and coal analyses from test holes drilled during 1978
in Campbell and Converse Counties, Wyoming: U.S. Geological Survey
Open-File Report 80-851, 180 p.
Pipiringos, G. N., Chisholm, W. A., and Kepferle, R. C, 1965, Geology and
uranium deposits in the Cave Hills area, Harding County, South Dakota.:
U.S. Geological Survey Professional Paper 476-A, 64 p.
Rehbeln, E. A., 1977, Preliminary report on stratigraphy and depositional
environments of the lignites in the Fort Union Formation, west-central
North Dakota: U.S. Geological Survey Open-File Report 77-69, 23 p.
Searight, W. V., 1930, A preliminary report of the coal resources of South
Dakota: South Dakota Geological and Natural History Survey Report of
Investigations 3, 46 p.
Winchester, D. E., Hares, C. J., Lloyd, E. R., and Parks, E. M., 1916, The
lignite field of northwestern South Dakota: U.S. Geological Survey
Bulletin 627, 169 p.

UNITED STATES GEOLOGICAL SURVEY HOLE NOcD-78072
SHEET 1 OF 2
AREA Southern Williston Basin QUAD NAME Ludlow SE
DATE START.ED 10-25-1978 DATE COMP. 10-26-1978 COUNTY Harding STATE South Dakota
LOCATION: SEC. 3A T. 22 N., R. 6 E. , FOOTAGE LOC. 890
FNl
1650 Ffl GROUND
{LEV 3090
SIZE AND BIT TYPE: s-m.wing
DRILLING AGENCY: USGS/CD/NRMA
ROT»R» ACQ
DRILL TYPE:
foona
ICORIWC
Portadrill 524
lom
400
DEPTH
DEPTH TO
WATER NR
11
27
LITHOLOGY RECORDED BY F. B. Kistner GEOPHYSICAL LOGS RECORDED BY G. A. Hollomon
73
93
REMARKS: Gamma ray logged through drill pipe
" Noisy" SP curve
SP • 20 MV
RCS = IO OHMS
130
LITHOLOGY
Sandstone, It-brn, silty, w/white
quartzlte flakes; thin lignite at 5ft
Claystone, light-gray, 2 ff
lignite, at 15 ft.
Sandstone, light-brown, fine,
moderately well sorted, weakly
cemented, micaceous, weathered.
Claystone, with lignite interbeds
from 78 to 83 and 86 to 89 ft;
weathered to 90 ft.
Sandstone, gray, fine to medium, poorly
sorted (clayey) iri part, weakly
to strongly (125-127 ft) cemented,
"salt- and-pepper" appearance.
Siltstone, gray to dark-brownishgray
with lignite beds from 157 to
164 and 177 to 179 ft; probable
lignite beds from 145 to 148 and
from 315 to 316 ft. Numerous
thick to very thick interbeds of fine
sandstone, and thin cemented streaks
below 140 ft.
i7a
I.e.
GAMMA
A_ SEC. RANGE __L CPS
LOGGING SPfFn I6-17 fi/MiN
LOGGED DEPTH 390
I—r
iM
Hf
LOGGING SPEED_!i:lZ_FT/MIN
LOGGED DEPTH _220_____
SE j?es-3- 50-
DEPTH
O-i-O
-10
•20
100- _-30
150-
40
-50
-60
200-
250-
-90
300-
350-"
-70
-80
-100

REMARKS:
LITHOLOGY
Siltstone, gray-to dark-brownish-gray,
w/ith numerous thick to very thick
interbeds of fine sandstone.
390 LTD " '
,
•
.
•
•
•
UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78072
a: o
:~^0
GAMMA
TC 4 fjFCBaNfip 5 r.P«;
inncinr.

UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78073
SHEET 1 OF 1
AREA Southern Williston Basin QUAD NAM Ludlow SE
DATE STARTED 10-26-1978 DATE COMR 10-26-1978 COUNTY Harding STATE South Dakota
LOCATION: SEC. is T. 21 N., R. 7 E. , FOOTAGE LOC. 1950
FNl
}W1 50 FWl
SIZE AND BIT TYPE: 5-in,wing ROTARY 200
FQQTACt
I CORING
20
63
DRILLING AGENCY: USGS/CD/NRMA DRILL TYPE: PortadriU 524
GROUND
ELEV
TOTAL
3090
DEPTH 200
DEPTH TO
WATER
LITHOLOGY RECORDED BY F. B. Kistner GEOPHYSICAL LOGS RECORDED BY G. A. Hollomon
REMARKS:
101
SP« 20 MV
RES= 10 OHMS
LITHOLOGY
Sandstone, very light gray, fine,
weakly cemented, weathered.
Siltstone and claystone, light-brown
to gray; with interbeds of lignite
from 30 to 45 ft and from 48 to 52
ft. Weathered to 30 ft.
Sandstone, light-gray, fine to
medium, moderately to strongly
cemented.
Siltstone and claystone, darkgrayish-brown
to light-gray, mostly
carbonaceous, with a 6-ft lignite
interbed at 165 ft. Thick sandstone
interbeds to 115 ft.
184 Ss, locally strongly cemented;
probable lignite interbed from 187 to
200 LTD '• 189 ft
GAMMA
T.C._i.SEC. RANGE—L_ CPS
LOGGING SPEED Jilii—FT/MIN
LOGGED DEPTH ^°°
LOGGING SPEEDjLllZ- FT/MIN
LOGGED DEPTH _ _ M .
NR
DEPTH
50-
-10
-20
100--30
150-
•40
-60
200-
250-
-50
•70
80
-90
300-
350-"
-100

UNITED STATES GEOLOGICAL SURVEY HOLE NOcD-78074
SHEET 1 OF 2
AREA Southern Williston Basin QUAD NAM Ludlow SE
DATE STARTED 10-27-1978 DATE COMR 10-27-1973 COUNTY Harding STATE South Dakota
LOCATION: SEC. 19 T. 21 N., R. 1 E. , FOOTAGE LOC. 700 ^^ 50 ^
SIZE AND BIT TYPE: 5-in. wing ROTARY 500
FOqUGt
ICORING
DRILLING AGENCY: USGS/CD/NRMA DRILL TYPE: PortadriU 524
LITHOLOGY RECORDED BY F. B. Kistner GEOPHYSICAL LOGS RECORDED BY G. A. Hollomon
REMARKS: Gamma ray logged through drill pipe
SP

REMARKS: SP' IO MV
RES = IO OHMS
415
500 LTD
LITHOLOGY
Siltstone, light-gray to dark-brownishgray
J mostly carbonaceous. Fine sandy
interbeds increasing downward
Sandstone, medium-gray, fine, weakly
cemented, "salt-and-pepper"
appearance, micaceous, occasional
thin cemented stringers. Dark-graybrown
clayey siltstone interbed
from 458 to 472 ft.
UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78074
SHEET 2 OF 2
— C3
ee o
GAMMA
T. C._^ SEC. RANGE _ 1 _ CPS
LOGGING SPEED J ± 1 L F T / M I M
LOGGED DEPTH ^^0
LOGGING SPEED JLiZ—FT/MIN
LOGGED DEPTH 500
GR
350^
DEPTH
--no
-120
400-
450-
-130
•140
-150
500-
-160
550-
-170
600-
650-
700-
750-
--180
-190
-200
_-210
-220

56
AREA
Southern Williston Basin
DATE STARTED io-28-i978 DATE COMR 10-28-1978
LOCATION: SEC. 22 T. 21 N., R. 7 E. , FOOTAGE LOC.
SIZE AND BIT TYPE: s-m.wing
DRILLING AGENCY: USGS/CD/NRMA
LITHOLOGY RECORDED BY F. B. Kistner
REMARKS:
114
SP > 20 MV
RES • 10 OHMS
LITHOLOGY
Sandstone, very light brownish-gray,
fine-to-medium, weakly cemented,
slightly micaceous, with occasional
lighp-brown oxidation streaks.
Lignite and siltstone, black tobrownish-black,
some sub-conchoidai fracture
and cleat pattern apparent;
clayey siltstone, medium-gray to dark-!
grayish-brown. Weathered to 63 ft.
Lignites from 69 to 77 ft; 82 to 89 ft;
93 to 100 ft; 106 to 114 ft.
Siltstone, medium-brownish-gray to
medium-gray, mostly carbonaceous;
numerous thick, fine sandy
interbeds and occasional thin cemented
zones. Sand content increases
below 250 ft, and color becomes
medium gray. Possible lignites
211 - 215 ft, and 246 — 247 ft
300 LTD-
UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78075
SHEET 1 OFI

62
97
AREA Southern Williston Basin
DATE STARTED 10-28-1978 DATE COMR
LOCATION: SEC. 30 T. 22 N., R. 9 E. , FOOTAGE LOC
SIZE AND BIT TYPE: 5-in.wing
DRILLING AGENCY: USGS/CD/NRMA
LITHOLOGY RECORDED BY F. B. Kistner
REMARKS:
150
Gamma ray logged through drill pipe
• SP " 10 MV
Res » S OHMS
LITHOLOGY
Siltstone, light-olive-gray to mediumgrayish-brown,
clayey, mostly
carbonaceous. Thin fossiliferous
limestone at 15 ft. Weathered to
30 ft.
Siltstone, light-brownish-gray, fine
sandy, slightly carbonaceous.
Siltstone and claystone, lightbrownish-gray,
with occasipnai
cemented zones.
Siltstone, medium-grayish-brown,
fine sandy, carbonaceous.
208 Sandstone, medium-gray, fine, weakly
cemented, slightly micaceous, strongly
cemented from 217 to 223 ft.
Minor dark-grayish-brown carbonaceous
siltstone.
247
Siltstone, medium-gray to dark-gra-yish-brown,
with very thick interbeds
of fine sandstone, and occasional
cemented zones. Thick lignite interbed
occurs at 301-304 ft.
UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78076
SHEET 1 OF 2

REMARKS:
5P= IO MV
ReS= 5 OHMS
LITHOLOGY
Siltstone, medium-gray to dark-grayish-brown,
with very thick interbeds
of fine sandstone, and occasional
cemented zones. Sandstone decreases
with depth below 400 ft. Thick
lignite interbeds occur at 362-366 ft
397-399 ft; 513-517 ft.
530 LTD-
UNITED. STATES GEOLOGICAL SURVEY HOLE NOCD-78076
SHEET 2 OF 2
a.
GAMMA
T.C._8_ SEC.• RANGE __L_ CPS
LOGGING SPEED _i±ll_FT/MIN
LOGGED DEPTH "0
13
LOGGING SPEE0_J6J2_ FT/MIN
LOGGED DEPTH _ a 5
pes
DEPTH
350-1
400-
450-
500-
-110
-120
-130
-150
-160
550-
-170
600-
650-
700-
750-1
•140
--180
-190
-200
-210
-220

- 60
_ 98
AREA Southern Williston Basin
DATE STARTED 10-29-1978 DATE COMR
LOCATION: SEC. 19 T. 22 N., R. a E. . FOOTAGE LOC.
SIZE AND BIT TYPE: s-m.wing
DRILLING AGENCY: USGS/CD/NRMA
LITHOLOGY RECORDED BY F. B. Kistner
REMARKS: Gamma ray logged through drill pipe
SP- ZO MV
Res. = 10 OHMS
ELECTRIC LOG SPLICE AT I4S FT.
134
LITHOLOGY
Siltstone, light-gray to medium-browi*^777
ish-gray, clayey, becoming
carbonaceous below 40 ft. Thin gray fi^f
limestone bed at 35 ft. Weathered
to 20 ft.
Sandstone, dark-gray to gray, flne^
micaceous, weakly cemented and argillaceous
to 70 ft. Strongly cemented
calcareous zones below 95 ft.
Siltstone, light-brownish-gray to
medlum-graylsh-brbwn, carbonaceous;
with lignite interbeds from 108 to
112 ft, and from 116 to 121 ft.
Sandstone, gray, fine, poorly sorted,
weakly cemented to 155 ft. Strongly
cemented calcareous zone below 158 ft
162
265
Siltstone, dark-brownish-gray to very
dark brown, carbonaceous;
lignite interbeds from 165 to 172 ft,
from 222 to 227 ft, and from 230 to
234 ft.
Sandstone, medium-gray, fine, moderately
to poorly sorted, weakly
cemented, micaceous; minor
siltstone Interbeds.
311 Siltstone, light-brownish-gray,
slightly carbonaceous; occasional
very thick interbeds of mediumgray,
fine sandstone having a "saltand-pepper"
appearance. Possible
lignite interbed from 323 to 326 ft.
UNITED STATES GEOLOGICAL SURVEY HOLE HOCD-78077
SHEET 1 OF ?

REMARKS:
LITHOLOGY
Siltstone, light-brownish-gray,
slightly carbonaceous; occasional
very thick interbeds of mediumgray,
fine sandstone having a "saltand-pepper"
appearance.
Possible lignite Interbeds at
441-444 ft, and 476-478 ft.
490 LTD
UNITED STATES GEOLOGICAL SURVEY HOLE HOCD-78077
SHEET 2 OF 2
— ta
as o
^ ..a
GAMMA
T. C._i. SEC.• RANGE-5 CPS
LOGGING spprn 16-17 FT/MIN
LOGGED DEPTH fii!2
15-
LOGGING SPEED.
LOGGED DEPTH.
FT/MIN
350-1
400-
450-
500-
550-
DEPTH
600-
650-
700-
--110
750-»
-120
-130
-140
-150
-160
-170
--180
~-190
-200
.-210
-220

UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78078
SHEET 1 OF 2
AREA Southern Williston Basin QUAD NAM Tepee Buttes
DATE STARTED 10-30-1978 DATE COMR 10-30-1978 COUNTY Harding STATE South Dakota
LOCATION: SEC. 9 T. 22 N., R. 7 E. .FOOTAGE LOC. 45
FNl
55 FWl
SIZE AND BIT TYPE: 5-in. wing
ROTARY 420 JiUUJULL
I CORING
18
_ 68
DRILLING AGENCY: USGS/CD/NKMA DRILL TYPE: portadnii 524
GROUND
EltV
lOTAl
3020
DEPTH 420
DEPTH TO
WATER NR
LITHOLOGY RECORDED BY F. B. Kistner GEOPHYSICAL LOGS RECORDED BY G. A. Hollomon
REMARKS:
113
165
_ 208
LITHOLOGY
Sandstone, light-yellow-brown, silty,
weathered.
Siltstone, light-grayish-brown to
light-gray, weathered to 50 ft;
black lignite Interbed from 61 to
64 ft.
Sandstone, medium-gray, fine,
moderately to poorly sorted;
gray siltstone interbeds.
Siltstone, medium-gray to dark-gray-
Ish-brown, carbonaceous in part;
black, chippy lignite interbed
from 159 to 162 ft.
Sandstone, medium-gray, fine, moderately
well sorted becoming wellsorted
below 185 ft; weakly cemented
except near top of unit, "salt-andpepper"
appearance.
Siltstone, medium-gray (above
lignites) to medium-brownlsh-gray,
carbonaceous; black lignite
Interbeds from 248 to 256 ft and
from 258 to 263 ft.
284 Sandatone, light-gray, very, fine to
fine, "salt-and-pepper" appearance;
siltstone interbeds.
314
Siltstone, medium-brownlsh-gray to
light-gray, sllghty carbonaceous,
mostly very fine sandy; sand
content increasing below 340 ft.
— C3
ae o
GAMMA
T.C.J_SEC-RANGE_1_ CPS
LOGGING SPEED J±1L_FT/MIN
LOGGED DEPTH ^^7
LOGGING SPEED.
LOGGED DEPTH.
, FT/MIN
DEPTH
0-1-0
50-
-10
-20
100--30
150-
• 40
-50
-60
200-
250-
-90
300-
350-"
_-70
•80
-100

REMARKS:
LITHOLOGY
Siltstone, medium-brownish-groy to
light-gray, sllghrly carbonaceous,
mostly very fine sondy; sand
content increasing below 340 ft.
UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78078
SHEET 2 OF 2
a.
— C3
as o
•i'.y.r. '..;:
~z.:.rT
rr.^:.:-:
— ~ . " j .
".".TT.V.
h:i
GAMMA
TC 8

UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78079
SHEET 1 OF 2
AREA Southern Williston Basin QUAD NAME tudiow
DATE STARTED 10-31-1978 DATE COMR 11-1-1978 COUNTY Harding STATE South Dakota
LOCATION: SEC. 26 T.22 N. , R. 5 E. .FOOTAGE LOC. 600 xn 500 FWl
FSl
SIZE AND BIT TYPE: 4-3/4 m. Trlcone; S-ln.wlng ROTARY 620 £MIAM-
CORING
DRILLING AGENCY: USGS/CD/NRMA DRILL TYPE: PortadriU 524
LITHOLOGY RECORDED BY F. B. Kistner GEOPHYSICAL LOGS RECORDED BY G. A. Hollomon
GROUND
ElEV 3300
TOTAl
DEPTH 620
DEPTH TO
WATER NR
REMARKS: Gamma ray logged through drill pipe. Collared at top of E-Sandstone (Pipiringos, etal, 1965),
Tongue River Member, Fort Union Formation.
SP.20MV RES •> IO OHM5.
150
LITHOLOGY
Sandstone, light-yellowish-brown to
medium-gray, fine to occasionally
coarse, poorly sorted, strongly
cemented above 7 ft, moderately
cemented from 7 to 50 ft, and weakly
cemented below 50 ft except near
base of unit, "salt-and-pepper"
appearance; silt increases below
92 ft; unit includes thick to very
thick gray siltstone Interbeds;
radioactive zones below 92 ft.
Weathered to 50 ft.
Siltstone, light-gray to darkgrayish-brown,
mostly carbonaceous
above 280 ft; lignite interbeds
from 153 (?) to 155 ft, from 181 to
189 ft, from 194 to 198 ft, from
282 to 286 ft, from 288 to 292 ft,
and from 294 to 296 ft. Uppermost
lignite may be thicker than
indicated by geophysical log.
333 Sandstone, light-to medium-gray, fine,
poorly sorted (silty to clayey);
thin cemented zones.
— ca
ae o
GAMMA
T.C._i. SEC.-RANGED
LOGGING SPEED J±1Z_FT/MIN
LOGGED DEPTH _110____
CPS
LOGGING SPFFn 16-17
LOGGED DEPTH _ i Z l
.FT/MIN
DEPTH
O-T-O
50-
100-
150-
200-
250-
300-
350-1
-10
-20
•30
• 40
-50
-60
-70
•80
-90
-100

REMARKS:
389
RES -- 10 OHMS
LITHOLOGY
Sandstone, light-to mediom-gray, fine,
poorly sorted (silty to clayey.)J
thin cemented zones.
Siltstone, medium-gray to mediumsbrown,
mostly carbonaceous;
lignite interbeds from 403 to 408 ft,
and from 411 to 413 ft, and possible
lignites from 514 to 518 ft. and from
592 to 597 ft. Fine sandy zones
occur near the top and bottom of the
unit.
610 LTD
UNITED STATES GEOLOGICAL SURVEY HOLE NOcD-78079
SHEET 2 OF 2
GAMMA
T.C.J_ SEC.• RANGE _ L _ CPS
LOGGING SPEED i±:il_FT/MIN
LOGGED DEPTH ^^°
LOGGING SPEED J6_il_ FT/MIN
LOGGED DEPTH-JIQ
•
SP Res
Tyrrmr
DEPTH
350-1
400-
450-
500-
-110
-130
-150
-160
550-
-170
600-
650-
-200
700-
750-»
•120
•140
--180
-190
-210
-220

AREA Southern Williston Basin
DATE STARTED 11-1-1978
UNITED STATES GEOLOGICAL SURVEY HOLE NOCD-78080
SHEET 1 OF 1
QUAD NAME tudiow SE
LOCATION: SEC. i4 T. 21 N., R. 6 E. , FOOTAGE LOC. 2590
SIZE AND BIT TYPE: s-m.wing
DRILLING AGENCY: USGS/CD/NRMA
LITHOLOGY RECORDED BY F. B. Kistner
REMARKS:
Gamma ray logged through drill pipe
SP> 20 MV
RES • 10 OHMS
LITHOLOGY
Siltstone, light-gray to grayishbrown,
mostly carbonaceous;
lignite interbeds from 32 to 34 ft,
from 35 to 43 ft, from 104 to 113 ft,I^-'.-^I^TI
from 119 to 124 ft, from 178 to
180 ft; possible lignite
interbed from 132 to 136 ft. Very
thick fine sandy zones occur through-l^^out
the unit. Weathered to 50 ft.
182
190- Sandstone
Siltstone, medium-grayish-brown, carb
- 200 LTD
DATE COMP 11-1-1978 COUNTY Harding STATE South Dakota
ROTARY 200
FNl
2500
miML
CORING
DRILL TYPE: Portadnii 524
FEl
GROUND
ElEV
Tom
DEPTH
DEPTH TO
WATER
GEOPHYSICAL LOGS RECORDED BY G. A. Hollomon
GAMMA
T.C. ± _ SEC. RANGE _ L CPS
LOGGING SPEED-iiziZ—FT/MIN
LOGGED DEPTH ^00
20
LOGGING SPEED JLiL-FT/MIN
LOGGED DEPTH _J22
-MV +
3110
200
NR
DEPTH
0-rO
50-
100-
150-
200-
250-
300-
350-'
-10
-20
-30
-40
-50
-60
-70
•80
-90
-100